I had tonsil cancer in November 2007; tonsils removed and 7 weeks of radiation, with one day/week chemo. I have a sweet putrid mucus that stays in my mouth all the time and most doctors think it is an after effect to radiation. However, it has been almost 4 years since my treatments. Following treatments, I had the normal metallic taste, heavy mucus, sore tongue, trouble swallowing, etc. Then things started getting better. But, not for long. About 1 1/2 years ago I started having this sickening taste, with frothy mucus, sometimes pasty in my mouth 24/7. I cannot find a doctor or hospital who will explore other causes than radiation. I suspect bacteria infection (possibly pseudonomas which has sweet taste), but have been unable to find a hospital or doctor who will check this out.